Continuously actuated one revolution clutch



July 18, 1950 v. F. LINDER coNTINuousLY ACTUATED om: REVOLUTION CLUTCH Filed June 18, 1945 2 Sheets-Sheet l GWMWL V. F. LINDER CONTINUOUSLY ACTUATED ONE REVOLUTION CLUTCH July 18, 1950 2 Sheets-Sheet 2 Filed June 18, 1945 me/who@ Victor. :En Linder Patented July 18, 1950 CONTINUOUSLY ACTUATED ONE REVOLUTION QLUTCH Victor F. Linder, MinneapoliahMinn., assigner to l Albert T.v ONel, Minneapolis, Minn.

Application June 18, 1945, Serial N0. 600,118 'z Claims.w (o1. 74 125.5

`My invention relates to power driven tools and particularly 4to tools similar to punches and shears in which a reciprocating member or crosshead or ram is cyclically operated to give'said cross-head a power'stroke and a return stroke.

"An object of the invention resides Iin providing apower tool of such naturev in which a constant time is required for performing the power stroke and return stroke and in which' varying periods of rest occur between cycles to Vary the number of operations in a given unit of time without affecting the performance of the tool.

' Another object of the invention resides in providing the tool with a continuously rotating 'driving member and in further providing connecting means between said member and cross-slide, whereby the cross-slide may be reciprocated during a rotation of said member and in which connection'of said cross-slide to said driving membierv terminates upon completion of the. return stroke of the cross-head.

4 An object of the invention resides in providing. timing means acting upon said connecting means to control theloperation thereof.

Another object of the invention resides in providing a device actuated bythe cross-head on itsi return stroke for energizing the timing means. A still further object of the invention resides utilizing a dash pot as the timing means and in providing means for resetting said dash pot bythe cross-headupon its return stroke.

VA feature of the inventionresides in utilizing acrank shaft for operating said reciprocating member and in providing a clutch between said driving member and shaft andin controlling the disengagement of said clutch by said timing means;` v Y An object of the invention resides in providing an arm for operating said clutch and a lever for moving said arm and in further connecting said dash pot to said lever.

Other objects of the invention reside in the novel'combination and arrangement of parts and in the details of construction hereinafter illustrated` and/ or described.

` In the drawings:

Fig. I1 is a fragmentary side elevational view partly in section of a power driven shear illuS- thereto.

Fig. 2 is `an elevational vertical transverse sec` tional view taken on line 2--2 of Fig. 1.

parts in altered position.

Fig. 4 is an elevational longitudinal sectional view of the dash pot used with the invention.

In the use of power driven shears, punches and.

similar tools, in which a reciprocating cross-head or ram is employed, it becomes highly desirable to control the number of operations rendered by the machine in a` given time.

the machine. The result has been that the length of'time employed in performing the operation has also been varied, withthe result that the performance has not been uniform. The in. stant invention overcomes this disadvantage by providing a power driven tool in which the same length of time is required for the performance of` each operation, but in which the period of l rest between operations can be varied to produce any number of operations in a given time.

'For the purpose of illustrating my invention, I have shown in the drawings a portion of a shear indicated in its entirety by the reference numeral I0. Inasmuch as power driven shears are well known in the art, only a portion of the shear has been shown in detail. The shear I0 com-` prises a base I I which has issuing upwardly from it two guides, one of which is shown in the draw-i ings and designated by the reference numeral I2. A cross-head I3, having bosses I4 thereon slidable along the saidguides, is guided by and movable in a vertical direction toward and from the base II. The base II has attached toit a xed shear blade I5, while the cross-head I3 has attached to it a shear blade I6 movable towar and from the shear blade I5.

Attached to the upper ends of the guides I2'l are bearings I'I which rotatably support a shaft I8. Shaft I8 hasA eccentrics I9 secured to the parted to it a power stroke during which the blade I6v cooperates with the blade I5 to shear material placed therebetween and that said cross-head further has imparted to it a return stroke in which the blade'IS is moved away from l,

the shear' blade I5;

`Attached to the shaft I8 adjacent one end of` the bearing I'I and abutting against the outerl face 23 thereof is a collar 24 which is keyed to said?v shaft by Vmeans of a key25. Adjacent this collar and rotatably 'mounted on the protruding end 200i the shaft I8vis a ily-wheel 26 which is held- .in place adjacent the collar 24 by means of an- Heretofore, this` has" been accomplished by changing the speed of` other collar 21. The collar 21 is attached to the end 20 of shaft I8 by means of a set screw 28. Fly-wheel 26 is driven by means of a belt 29 passing over the same and serves as the driving member of the tool. When the ily-wheel 26 is connected to the shaft I8, the said shaft reciprocates the cross-head I6 which becomes the driven member of the tool.

For affecting a driving connection between the flywheel 26 and the shaft I8, a clutch, indicated in its entirety by the reference numeral 3|, is employed. This clutch comprises an elongated key 32 which is slidable along a longitudinal groove or guideway 33 formed in the collar 24. The key 32 slides in this groove and rests upon the outer surface of the portion 20 of shaft I8. The end 34 of key 32 is adapted to enter into either of two notches 35 formed in the inner face 36 of the hub 31 of fly-wheel 26 and forming abutments for engagement with said key. The key 32- is urged toward the fly-wheel 26 by means of a coil spring 38 having a relatively few number of convolutions. This coil spring is mounted in an annular groove 39 formed in the end of the collar 24 and intersecting the guideway 33. The spring 38 is seated at one end against the face 23 of bearing I1 and at its other end against the end of the key 32 opposite the engaging portion 34 thereof.

For the purpose of controlling the operation of the clutch 3l, an arm 4I is employed, best shown in Figs. 1 and 2. This arm is pivoted by means of a stud 42 to the base II of the shear and extends upwardly and diagonally therefrom toward the collar 24. The upper end 43 of said arm is received within an annular groove 44 in the outer periphery of said collar and fits snugly therein so that the upper portion of the arm 4I is restrained from later-al. movement by the collar 24. The end 43 of the arm 4I is beveled, as best shown in Fig. 1, and has a sharpened point 50. at the outer end thereof. The end 43 of the arm 4I is adapted to enter into a notch 45 in the key 32 engaging the shoulder formed thereby and, due to the bevel of the said end of the arm, isadapted to shift the key 32 toward the left as viewed in Fig. 1,v against the action of the spring 38. When the key has been so shifted, the vportion 34 thereof is withdrawn from engage,-r ment with the notches 35 in ily-wheel 26, and the clutch 3l becomes disengaged, the fly-wheel 26 rotating freely upon the end 20 of shaft I8.

Pivoted to the base I I at a locality opposite the stud 42 is a link 46 which extends upwardly toward the arm 4I. This link is mounted on a stud 41 similar to the stud 42. The link 46 has pivoted to it by means of a bolt 48 a lever 49 which is also pivoted to the arm 4I by means of a bolt I. The lever 49 may swing from its extreme positions as shown in Figs. 2 and 3. When in the position shown in Fig. 2, the end 43 of arm 4I is in a position to engage the notch 45 in key 32. When in the position shown in Fig. 3, the said portion of the arm is out of the path of travel of key 32. It will be noted that the extreme end of the link 46, which is indicated at 52, serves as an abutment for engaging the arm 4I and thus limits movement of the said arm to the position shown inFig. 3. The arm 4I and link 46 are normally urged into the position shown in Fig. 34 by means of a tension coil spring 5-3 which is secured toboth said link and arm.

Operating in conjunction with the link 46 and lever 49 is a dash pot 54 shown in detail in Fig. 4:. rJZ'h-is dash pot comprises a cylinder 55 havingA a 4 head 56 integral therewith. Within the cylinder is slidably mounted a piston 51 making a fairly close fit with the cylinder. This piston has a connecting rod 58 screwed into the same and which terminates in an eye 59. The said piston has a number of openings 6I extending longitudinally through the same which openings are closed at their outer ends by means of a valve disk 62 seated upon the outer end 63 of said piston. This valve disk encircles the connecting rod 58 vand is urged into closing position by means of a compression coil spring 64 also encircling the connecting rod 58. The coil spring 64 is seated at its outermost end against a washer 65 held in adjusted position o'n the connecting rod 58 by means of a pin 66. The pin 66 is insertable into any one of a number of holes 61 whereby the pressure exerted by the spring 64 may be adjusted.

The dash pot 54 is provided with a leakage passageway 68 which communicates with the interior vvof the cylinder 55 and with the atmosphere.' This passageway is adapted to be closed by an adjusting screw 69 having a head 1I accessible vfrom the exterior. By manipulation of the screw 69, the time required for the piston 51 to move from its inner end toward its outer end may be predetermined and varied. ,Y

The dash pot 54 is mounted on a bracket 12 integral with and extending outwardly from the link 46. A bolt 13 passes through the, end of said bracket and throug'ha hole 14 in the head 56 of cylinder 55. In this manner, the said cylinder is pivoted for oscillating lmovement on the bracket 12. A bolt I14 extends through the lower end of an arm 15 of lever 49Vand through` th eye 59 of connecting rod '58. This bolt pivotallyycnnects the said connecting rod to the lever 49. It will readily be comprehended that relative movement `of the lever 4i 'and link 46 from the position shown VinFig. 2 to that shown in Fig. 3 is motivated bythe spring 53, but that such move-'- ment is timed by the leakage of 'air from 4the atmosphere 'and vinto the cylinder 55 through passageway 68, as the piston 51 travels from its innermostposition 'to that shown in Fig. 4.y On the return movement of the-piston 51 towards its innermost position, air is forced through the pas= s'ageways 6I and past the 'valve disk 62, permitting the piston to bequi'ckly moved toward 'its inner position and the dash pot to be reset.

For the purpose of moving the arm 4I from its position show-n in Fig. 3 to that shown in Fig.-2, the following construction lis employed. Mounted on the bolt 48 is a roller 16. This 'roller is adapted to. be. engaged by a cam 11 secured to the cross*- head I3 b'y-means of screws 18. The cam 11 has a cam surface 19 which engages the roller 16 and swings the lever 49 outwardly, While the crosshead I3 travels from Vits uppermost to its lowermost position. 1

The operation of my invention is as follows.: Assuming that a power stroke of the shear has been made and that the shear cross-head is travelingup. The parts would'then be arranged as shown in Fig. 1 with the end 34 of key 32 en-v gaged with one of the notches 35 'of fly-wheel 26 and the said fly-wheel driving the shaft I8. 1t will be noted that the notch 45 in key 32 intersects the groove 414, as best shown in Fig. 1, when the key 32 is fully engaged with the notch 35 of fly-wheel 26,. When the shaft I8 turns over sufciently, the sharpened 'end 43 of the arm "4.1 entersthef-notch 45. and `shifts, the key 32 agaitt the action of the spring 38 toward the left, a8

viewed in Fig. 1, until the' engaging. end34 is moved out of the, notch- 35 in said fiy-wheel. Spring 53 is now urging the` arm4l to move outwardly toward the position shown in Fig. 3, which.

movement is timed bythe dash pot 54. When arm 4I reaches the positionshown in Fig. 3, the arm 4I becomes disengaged from the key 32 and spring 38 urges said key toward the fly-wheel 46. As soon as one of the notches 35 reachesa position opposite the key 32, the end 34 of said key is forced into saidl notch and a drive is effected for the shaft I8. The shaft I8 now rotates in a counterclockwise direction, as viewed in Figs. 2 and 3, moving the cross-head I3 downwardly. During su'ch downward movement, the cam 11 engages roller IG and the arm 4i is moved back into the position shown in Fig. 2. The cam 'I1 is so arranged that such movement does not occur until the key 32 is out of the way of the end 43 of arm 4I. When the shear reaches its lowermost position, the parts are arranged as shown in Fig. 2. Asthe shaft I8 continues'to rotate, key 32 is moved from the positionshown in Fig. 2 to that shown in Fig. 3whi1e the arm 4I is still inthe position shown in Fig. 2. During such movement, the point u of the end `I3 of said arm enters lthe notch45 and disengages the' key from the flywheel 26, permitting the same to again idle on the shaft I8. The operation is again repeated after the dash pot 54 permits the spring 53 to bring the parts to the position shown in Fig. 2. It will readily be comprehended that the length of time required to operate the shear depends upon the speed of rotation of the fly-wheel 26 and is independent of the controlling mechanism. It will also readily become comprehended that the period of dwell between operations of the shear is controlled by the dash pot 54 and that the timing procured by the dash pot may be controlled by the screw 69. Thus, any number of operations within the limits of the device may be procured for1 a unit of time, so that the rapidity of time with which the machine operates may be readily controlled.

The advantages of my invention are manifest. The shear operates at the same speed, regardless of the number of operations performed during a period of time. The shear performs a single operation and then automatically stops until the timing mechanism sets it into operation again. By means of the adjusting screw on the dash pot, the period of dwell between operations can be varied to give any number of operations within the limits of the device within a given length oi' time. Such an adjustment can be made while the machine is running. The device is extremely simple and has no complicated or delicate parts to get out of order. The invention may be readily applied to existing machines without material alteration or reconstruction thereof.

While I have explained the invention as particularly adaptable for use With a power driven shear or punch press, it can readily be comprehended that the device can be used for other purposes and in connection with other similar devices.

Changes in the specific form of my invention,

member, with said driving member, -an -armfor periodically controlling the .engagementof said; clutchtoeffect a drivefbetween saidv driving meme,

ber and said driven member and for controlling the disengagement of vsaid clutch at the .end'of a 2. In a power driven tool,:a cyclically operated driven member, a continuously rotating driving member, a clutch for connecting said driven member with said driving member, an arm for.- periodically controlling the engagement of said' clutch to effecta drive between said driving mem.

ber and said driven member and for controlling the disengagement of said clutch at the end of` a. cycle of operation of said driven member, a leverconnected to said arm and operating to swing the same from clutch-engaging to clutch-disengaging position, a dash-pot connected to saldi lever and controlling the movement thereof in which the arm is moved to clutch-engaging posi'` tion, and means operated by said driven member for resetting said dash-pot.

3. In a ,power driven tool, a base, a driven member supported on and movable relative to said base, a continuously rotating driving member carried by said base, a clutch for connecting said driven member with said driving member, an arm pivoted to said base and controlling the engagement of said clutch to affect a drive between said driving member and said driven member and for controlling the disengagement of said clutch when said driven member reaches a certain position relative to said base, a link pivoted to said base, a lever pivoted to said link and to said arm, said lever, upon swinging movement, causing the arm to move from clutch-engaging to clutch-disengaging position and a dash-pot connected to said lever.

4. In a power driven tool, a base, a driven member supported on and movable relative to said base, a continuously rotating driving member carried by said base, a clutch for connecting said driven member with said driving member, an arm pivoted to said base and controlling the engagement of said clutch to affect a drive between said driving member and said driven member and for controlling the disengagement of said clutch when said driven member reaches a certain position relative to said base, a link pivoted to said base, a lever pivoted to said link and to said arm, said lever, upon swinging movement, causing the arm to move from clutch-engaging to clutch-disengaging position and resilient means acting between said link and arm for moving said arm into clutch-engaging position and a dash pot connected to said lever and opposing such movement.

5. In a power driven tool, a reciprocating driven member having a power stroke and a return stroke, a continuously rotating driving member, a shaft, a, crank connected to said shaft and operating said reciprocating member, a clutch between said driving member and shaft, control means for periodically controlling the engagement of said clutch to affect a drive between said driving member and shaft and controlling the disengagement of said clutch at the end of the return stroke of said reciprocating member. time controlled means acting on said control member to determine the period during which said driven member remains inactive and means actuated by said reciprocating member during its power stroke for energizing said time controlled means.

6. In a power driven tool, a base, a, reciprocating member mounted for movementl relative to said base and having a power stroke and a return stroke, a shaft, a crank connected to said shaft and operating said reciprocating member, a continuously rotating driving member, a clutch between said driving member and shaft, an arm pivoted to said base and controlling the engagement of said clutch to effect a drive between said driving member and shaft and for controlling the disengagement of said clutch-upon completion of the return stroke of said reciprocating member, a link pivoted to said base and connected tov said arm. a dash-pot connected to said link and timing'the movement of said arm in its movement toward clutch-engaging position and means -carried by said reciprocating member and operating to move said arm into clutch-disengaging position and to reset said dash-pot.

l '7. In a power driven tool, a reciprocating driven member having a .power stroke and a return stroke, a continuously operating driving member, n

normally inactive connecting means for connech 8vr ing said driving member with said driven member' to procure operation of said driven member, con@l trol means for periodically rendering said -con-Jv necting means active to effect a, drive between said .driving and driven members and .for rene. dering said connecting means inactive at the end:l of a cycle of Voperation of said driven member;v time controlled means acting on saidl control means to determine the length of the periodidui-A ing which said driven member remains-inactive,v resilient means for energizing said time controlled means and tensioning means for tensioningsaidresilient means and operated by said driven mem-. ber during the power stroke thereof. v

REFERENCES l CITED The following references are of record'in theF le of this patent: '51 UNITED STATES PATENTS Number Name Date4 475,238 Eaton May 17, 1892,

800,214 Johnston, Sept. 26, 1905. 11,465,719 Peters Aug. 21, 1923y 2,051,752 Slocum Aug. `18, 1936, 2,325,102

Boschen July 27, 19431. 

